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Segment and Geographic Data - Information About Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 03, 2021 | Dec. 31, 2022 | Jan. 01, 2022 | Jan. 02, 2021
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | $ 1,040,856 | $ 1,212,463 | $ 1,378,124
Operating (loss) income |  | (282,950) | 196,284 | 216,162
Interest expense |  | 81,141 | 87,909 | 123,310
Other expense, net |  | 1,691 | 1,358 | 349
Early extinguishment of debt | $ 29,169 |  | 30,352 |
(Benefit from) provision for income taxes |  | (114,379) | 9,773 | 17,462
Net (loss) income |  | (251,403) | 66,892 | 75,041
Net loss attributable to the noncontrolling interest |  |  |  | 38
Net (loss) income attributable to WW International, Inc. |  | (251,403) | 66,892 | 75,079
Depreciation and amortization |  | 48,819 | 54,686 | 59,522
Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating (loss) income |  | (135,667) | 348,879 | 407,460
Depreciation and amortization |  | 34,181 | 41,941 | 42,742
General Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
General corporate expenses |  | 147,283 | 152,595 | 191,298
Depreciation and amortization |  | 14,638 | 12,745 | 16,780
North America |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | 726,884 | 814,797 | 942,100
North America | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | 726,884 | 814,797 | 942,100
Operating (loss) income |  | (219,875) | 217,901 | 269,580
Depreciation and amortization |  | 32,521 | 39,270 | 39,740
Continental Europe |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | 239,129 | 297,910 | 313,380
Continental Europe | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | 239,129 | 297,910 | 313,380
Operating (loss) income |  | 91,599 | 117,390 | 124,891
Depreciation and amortization |  | 763 | 1,468 | 1,615
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | 47,995 | 65,820 | 84,387
United Kingdom | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | 47,995 | 65,820 | 84,387
Operating (loss) income |  | (7,457) | 8,134 | 10,648
Depreciation and amortization |  | 627 | 799 | 1,017
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | 26,848 | 33,936 | 38,257
Other | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues, net |  | 26,848 | 33,936 | 38,257
Operating (loss) income |  | 66 | 5,454 | 2,341
Depreciation and amortization |  | $ 270 | $ 404 | $ 370

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